I have just changed to a nomadio react, I found a empty box on the left of the radio beside the wheel? It can be taken out but it's empty. What's that slot/box for? M I missing some parts?

What you found is what it is. The radio case was originally designed and used by Multiplex and was functional. Now its empty space.

Ed M.

What was inside that box?

If my memory is right it was the final for the transmitter. The Multiplex was a 7 channel surface setup that could do AM or FM and was way ahead of its time.

Ed M.

Bentgear is correct, that box housed the transmitter module for the Multiplex radio. Nomadio had some plans for expansion using that box, but unfortunately never got to that point in React development.

Well, I see if I can put a telemetry inside. I m using a beta Spektrum software, so I can use my Spektrum RX. But it doesn't support telemetry unless I use nomadio RX.